#include<iostream>
using namespace std;
long fun(int m,int n){
	 if(m==n||n==0)
	 return 1;
	 else
	 return m*fun(m-1,n)/(m-n);
	 }
	 int main(){
	 	 int m,n;
	 	 cout<<"Please input m and n:";
	 	 cin>>m>>n;
	 	 cout<<"c(m,n)="<<fun(m,n)<<endl;
	 	 system("pause");
		 }
